hi

this code's working fine for localhost, and i got no timestamp reply when i tried this code to another host, would you try this code in your LAN ?

##Update-1##
Working fine for localhost ?
of course, we still can get timestamp reply even if the checksum value is incorrect (but just remember it's only for Localhost!)
##EndOfUpdate-1## 

use strict;
use Socket;

use constant ICMP_TS => 13;
use constant ICMP_STRUCT => "C2 n3 N3 A"; # Structure of a minimal ICM
+P packet
use constant SUBCODE => 0;
use constant ICMP_FLAGS => 0; # No special flags for send or recv
use constant ICMP_PORT => 0; # No port with ICMP
use constant IOT => 0; #ICMP originate timestamp
use constant IRT => 0; #ICMP receive timestamp
use constant ITT => 0; #ICMP transmit timestamp


ping_icmp();
sub ping_icmp
{
  my ($ip) = inet_aton('192.168.0.2');
  my ($saddr, $checksum, $msg, $len_msg);

  my $seq = 1;
  my $pid = $$ & 0xffff;
  $checksum = 0; # No checksum for starters
  my $data= "";
  $msg = pack(ICMP_STRUCT . 0,ICMP_TS,SUBCODE,$checksum,$pid,$seq,IOT,
+IRT,ITT,$data);
  $checksum =checksum($msg);
  $msg = pack(ICMP_STRUCT . 0,ICMP_TS,SUBCODE,$checksum,$pid,$seq,IOT,
+IRT,ITT,$data);
  $len_msg = length($msg);
  $saddr = sockaddr_in(ICMP_PORT, $ip);

  socket(SOCK,PF_INET,SOCK_RAW,1) or die "error: $! \n";
  send(SOCK,$msg,ICMP_FLAGS,$saddr) or die "error: $!\n";
}

sub checksum{
  my ($msg) = @_;
  my ($len_msg,$num_short,$short,$chk);

  $len_msg = length($msg);
  $num_short = int($len_msg / 2);
  $chk = 0;
  foreach $short (unpack("n$num_short", $msg)) {
    $chk += $short;
  } 

  $chk += (unpack("C", substr($msg, $len_msg - 1, 1)) << 8) if $len_ms
+g % 2;
  $chk = ($chk >> 16) + ($chk & 0xffff); # Foldhigh into low
  return(~(($chk >> 16) + $chk) & 0xffff); # Again and complement
}

[download]

thanks

In reply to icmp timestamp request, not sure by doctor_moron

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